The screen on top of the box discourages those who think they can fly out--they're already trying out those new feathers.
The little one below is in solitary because the others were pecking at her and made a raw place on her back. I put liquid band-aid on the wound and we separated her so her wound could heal. but she hates it! She spends all day pacing in front of the screen, crying to be back with the others.
I tried putting her back in with the others after the liquid band-aid dried. What happened? They immediately started pecking her again and she, poor thing, hunkered down and just took it. Who would think chicks could be so vicious? But this isn't unusual--I've raised several broods over the years and the weakest one is often attacked.
My hope is to get this one healed and strong so she can rejoin the flock. That may not be simple because there is a tendency to attack any bird considered a foreigner. I am gambling on the screen wire being enough of a divider to protect her while allowing her to remain familiar to the rest of the birds.